just wanna share my experience.
My daughter was born in S. korea, my husband is Canadian citizen.
We applied her citizenship in S .korea before her 100days.
What we send to Canada embassy in S. korea
for my husband
his birth certificate ( he had his original, but government changed whole design of certificate and Embassy has a guide book for which birth certificate is acceptable. so we had his parents sent his birth certificate from Canada )
photo copy of his passport.
for my daughter
her birth certificate from hospital.
korean government documents stated that she is registered under my (mom) family.
we did not send her korean passport, as matter of fact, she could make her korean passport after she had her canadian passport.
Before we sent her application form, we phoned so many time to embassy.
funny thing, every time we talked different person from embassy and we had new info all the time.
It would be different what canada embassy in England would ask for citizenship application.
but hope it helps though.
p.s we applied end of Oct 2013 and according to embassy in s. korea.
They are working on application received on May, 2013.
We are in Canada now and my daughter has not received her citizenship yet.